太西无烟煤基粉煤灰摩擦电选脱炭试验研究

针对太西无烟煤基粉煤灰未燃炭含量偏高的问题,研究分析了三种不同组分的粉煤灰理化特性,对三种粉煤灰进行了摩擦电选脱炭研究,确定了初步工艺流程,为今后粉煤灰的综合利用做好了前期准备工作。     

高炭粉煤灰浮选脱炭试验研究

高含炭量的粉煤灰是一种不可被直接利用的固体废弃物.为降低高炭粉煤灰的烧失量,对高炭粉煤灰进行脱炭试验研究.本文通过磨矿试验确定高炭粉煤灰原灰最佳磨矿时间为1.25 min;通过浮选药剂制度试验确定磨细高炭粉煤灰最佳浮选药剂制度为仲辛醇用量为4 kg/t,煤油用量为12 kg/t;通过浮选工艺试验,确定磨细高炭粉煤灰最佳...     

XZWXJ-45静态旋流微泡浮选柱在粉煤灰处理方面的应用

介绍了XZWXJ-45静态旋流微泡浮选柱的结构、工作原理及特性参数,主要性能特点及其在粉煤灰浮选脱炭工艺中的应用效果。分析了影响浮选柱工效的因素。     

粉煤灰浮选法脱炭的可行性研究

介绍了广东韵关钢铁公司粉煤灰的性质,采用浮选工艺流程,对其进行磨矿、粗选、扫选和二次精选后,可获得含碳量80.02%的精炭粉以及Ⅰ级粉煤灰,经济效益显著。     

谈粉煤灰的分选处理和利用

粉煤灰组成复杂，不同的利用工艺对粉煤灰的质量有不同要求。将粉煤灰进行重选、磁选、或浮选处理，然后再将各分选组分分别进行利用，制品的质量可以保证，经济效益也高     

粉煤灰选炭的试验研究

试验结果表明： 粉煤灰中的炭份,可从选矿的方法中分离出来,由于降低了粉煤灰中的含炭份,使其能广泛应用于建材等领域。     

浮选法回收粉煤灰中精炭技术

1　前言　　漳平电厂位于九龙江畔 ,漳平市西郊 ,始建于1 985年 ,总装机容量为 4× 1 0 0MW ,占地面积约 75公顷 ,四台机组设计锅炉使用的燃煤为当地产的白煤 ,燃烧后所产生的灰渣仍是有较高的烧失量 (2 0 %～ 30 % ) ,无法在建筑行业直接利用 ,只能经过浮选加工成为粉煤灰和精炭后再加以应用。2　浮选法回收精炭原理及技改项目来源　　回收粉煤灰中精炭是利用炭与硅铝酸盐对水润湿的差异 ,用浮选法分离回收炭。该法已被多家电厂用于生产 ,通过对湖南、广东及福建多家电厂粉煤灰回收资料分析 ,影响精炭回收的因素除捕收剂、起泡剂、抑制剂…     

降低粉煤灰含碳量的途径

本文介绍国内外先进的粉煤灰除碳技术和方法。     

用造纸废液作浮选剂从粉煤灰中选炭

齐齐哈尔造纸有限公司以落叶松为主原料,采用亚硫酸盐法制浆,生产过程产生的树脂脂肪酸皂废液（皂化物）,用途较窄,常在碱回收过程被烧掉。该皂化物具有较好的表面活性,可以任何比例溶于水中,经搅拌吹气后可以形成稳定的气泡。我们以该皂化物作浮选剂,用于从湿法磨...     

用浮选柱分选高炭粉煤灰的试验研究

介绍了当前粉煤灰资源化利用中存在的未燃炭含量超标问题 ,比较了为解决这一问题而采用的浮选机和浮选柱两种工艺。试验结果得出 ,双射流浮选柱浮选工艺的各项技术和经济指标大大优于常规浮选机浮选工艺。分离出来的精炭比表面积为 63m2 /g ,微孔含量高 ,可与其它工艺结合用来处理废水 ,其生产成本明显低于商业活性炭。     

分选与磨细粉煤灰对水泥胶砂性能的影响

研究了分选与磨细粉煤灰的颗粒分布与形貌的差异及对水泥胶砂性能的影响。研究结果表明:当勃氏比表面积相近,磨细粉煤灰的中位粒径大于分选细粉煤灰,其圆珠状颗粒较少,表面较为粗糙。在相同水胶比的条件下,掺分选粗粉煤灰的水泥胶砂流动度及强度均低;分选粗粉煤灰磨细后,不仅减少了颗粒的粘连,增加了比表面积,而且提高了粉煤灰的反应活性和水泥胶砂流动度及强度,虽其水泥胶砂流动度仍小于掺分选细粉煤灰的水泥,3d水泥胶砂强度也略低,但其28d水泥胶砂强度略高于掺分选细粉煤灰的水泥;在相同水泥胶砂流动度的条件下,掺磨细粉煤灰配制的水泥胶砂3d强度低于掺分选细粉煤灰的水泥,但随着水化龄期的增长,其差距逐步缩小,至60d时可超过后者。     

煤粉炉粉煤灰与循环流化床粉煤灰矿物学性质比较

为了提高粉煤灰的利用率,通过化学成分分析、扫描电子显微镜(SEM)分析、X射线衍射光谱(XRD)分析和核磁共振分析,对煤粉炉和流化床2种粉煤灰的形貌、物相组成和活性进行了表征,研究了2种粉煤灰矿物学性质的差别。试验结果表明:2种粉煤灰在形貌和物相上存在较大的区别。形貌上,煤粉炉粉煤灰中存在大量的玻璃微珠,而流化床粉煤灰由于成灰温度低不存在玻璃微珠;物相上,煤粉炉粉煤灰中存在较大量的结晶类矿物,而流化床粉煤灰多为非晶玻璃态物质。通过核磁共振分析发现煤粉炉粉煤灰中硅氧结构和铝氧结构的聚合度较高,不利于活性组分溶出。     

固硫灰渣和粉煤灰的特性对比分析

介绍了固硫灰渣的形成过程,并将固硫灰渣与粉煤灰的物化特性进行对比,分析表明:固硫灰渣与粉煤灰的化学成分类似,矿物组成差异较大;固硫灰渣与粉煤灰一样,具有较高的火山灰活性,用于建筑材料的生产完全可行.     

Electrodialytic removal of cadmium from straw combustion fly ash

Fly ash from straw combustion contains valuable nutrients when returned to agricultural soils. In many instances, however, this fly ash may contain heavy metals, such as cadmium, at levels which often exceed the limits given by the Danish legislation. Thus before utilizing the nutrients, cadmium must be removed from these ashes. The use of an electrodialytic remediation method to remove cadmium from fly ash arising from straw combustion and containing 11.2 mg Cd kg^?1 DM (dry matter) was accessed. After 36 days of remediation at a constant current density of 5.6 mA cm^?2 more than 97% of the cadmium had been removed from around 150 g ash on a dry basis. Copyright © 2004 Society of Chemical Industry     

Effect of pH on the flotation performance of incinerator fly ash

Flotation was proved to be effective for decarburization and removal of dioxins from hospital solid waste (HSW) incinerator fly ash, but weathering makes it difficult. The effects of three types of surfactants including nonionic (Tween 80), anionic (SDS), and cationic (CTAB) at different pulp pH values on the flotation performance of weathered HSW incinerator fly ash were investigated. Results showed that the corresponding optimal pH values of Tween 80, CTAB, and SDS were 7, 5, and 9 in terms of decarburization performance, respectively, which were validated by the measurement of Zeta potential. The total dioxins and carbon removal efficiencies showed good correlation at various pulp pH values with surfactant of Tween 80. The optimum surfactant type and pH value should be selected as Tween 80 and pH = 7 from the standpoints of the dioxin removal. Under the optimum condition, the lowest content of dioxins (2.7 ng I-TEQ/g) in the tailings was obtained. The content of heavy metals in the froths exhibited higher with addition of SDS compared with that with Tween 80 and CTAB.     

Detoxification of medical waste incinerator fly ash through successive flotation

Medical waste incinerator (MWI) fly ash is considered hazardous waste because it contains hypertoxic polychlorinated dibenzo-p-dioxins and dibenzofurans as well as heavy metals. To detoxify both substances, successive flotations of MWI fly ash were performed. The first step involved decarburization flotation, whereby 91.0% of the dioxins in MWI fly ash were transformed into a froth product. In the second step (ion flotation), the influence of ionic strength on heavy metals recovered from both raw and stimulated filtrates was explored. The results revealed that the optimal conditions were sodium dodecyl sulfate at 480 ppm, methyl isobutyl carbonyl at 150 ppm, impeller speed at 2000 rpm, and flotation time of 18 min for raw leachate, through which Zn (47.0%), Pb (56.5%), Cu (57.5%), and Cd (49.1%) were recovered. For the simulated filtrate, higher removal efficiencies were noted: 60.5%, 80.6%, 69.1%, and 64.1% for Zn, Pb, Cu, and Cd, respectively. The harmful effects of the coexisting ions in the raw filtrate on heavy metal recovery were observed.     

粉煤灰显微结构与流态化脱炭实验

在分析粉煤灰显微结构的基础上，提出了采用流态化方法脱除粉煤灰中残余炭并提高粉煤灰活性的基本思路，流态化分选实验表明：这种思路是有效的，这一思路将为解决我国粉煤灰的综合利用问题提供有益的借鉴。     

以粉煤灰为改性组份的石膏粉煤灰胶结材研究

在石膏体系中掺入适量粉煤灰，通过对粉煤灰活性的充分激发，可显著改善石膏建材的微结构与耐水性。研究了石膏粉煤灰胶结材（以下简称ＧＦＢ）的配制原理与方法，胶结材性能及应用，分析了胶结材水化硬化特点及粉煤灰的改性作用。为同时利用两种废渣、扩大粉煤灰在建材工业中的应用提供了一条新途径。     

Light‐weight thermal insulating fly ash cenosphere ceramics

Light weight fly ash cenosphere (FAC) ceramic composites were developed by simple slip casting method. Thermal properties, Bulk density, Microstructure, flexural strength, and phase analysis of the FAC ceramic composites were measured. The results proved that the FAC have ability to lower bulk density and thermal conductivity effectively. The lowest thermal conductivity achieved for FAC ceramic composites (0.27 W/m.K) was further reduced 0.21 W/m.K by adding combustible additives ie activated charcoal and corn starch. The flexural strength, bulk density and thermal conductivity of FAC ceramic composites reduced consistently with an increase in FAC content. The maximum flexural strength of 13.45 MPa was achieved with 50% FAC and the minimum flexural strength of 4.07 MPa was obtained with 80% FAC. The open porosity increased from 35.51% to 43.76% and 38.19% with an addition of 15% activated charcoal and corn starch, respectively, when compared to no additives. The bulk density of 699, 619, and 675 kg/m³ was achieved with 80% FAC, 80% FAC with the addition of 15% activated charcoal and corn starch, respectively. The 80% FAC ceramic composite shows low thermal expansion coefficient 6.54 × 10^?6/°C at the temperature of 50°C then it varies between 3.7 and 5 × 10^?6/°C in the temperature range above 100°C. These results prove that the developed light weight FAC ceramic are excellent low‐cost thermal insulating materials.     

粉煤灰农业利用研究进展

评述粉煤灰农业利用研究进展情况,并讨论其中存在的问题.对未来研究工作进行了展望.